Test microsoft/TypeScript#32924

Author: AnyhowStep

package-lock.json

@@ -44,6 +44,6 @@
     "typescript": "^3.5.1"
   },
   "dependencies": {
-    "type-mapping": "^1.17.0"
+    "type-mapping": "^1.19.3"
   }
 }

package.json

@@ -2,7 +2,6 @@ import {ColumnMap} from "../../column-map";
 import {IsNullSafeComparable, isNullSafeComparable} from "./is-null-safe-comparable";
 import {CompileError} from "../../../compile-error";
 import {TypeMapUtil} from "../../../type-map";
-import * as TypeUtil from "../../../type-util";
 import {tableAlias} from "../query";
 import {Writable} from "../../../type-util";
 

src/column-map/util/predicate/assert-is-null-safe-comparable.ts

@@ -1,6 +1,6 @@
 import {AnyRawExpr} from "../../raw-expr";
 import {usedRef, UsedRef} from "../query";
-import {UsedRefUtil} from "../../../used-ref";
+import {UsedRefUtil, IUsedRef} from "../../../used-ref";
 
 /**
  * Assumes `U` is a union
@@ -12,6 +12,8 @@ import {UsedRefUtil} from "../../../used-ref";
 export type IntersectUsedRef<
     U extends AnyRawExpr
 > = (
+    UsedRef<U> extends never ?
+    IUsedRef<{}> :
     UsedRefUtil.Intersect<
         UsedRef<U>
     >
@@ -26,6 +28,6 @@ export function intersectUsedRef<
 ) {
     const result : IntersectUsedRef<ArrT[number]> = UsedRefUtil.intersect(...arr.map(
         u => usedRef<ArrT[number]>(u)
-    ));
+    )) as IntersectUsedRef<ArrT[number]>;
     return result;
 }